Improved Electrochemical Detection of Zinc Ions Using Electrode Modified with Electrochemically Reduced Graphene Oxide

Materials

Jiri Kudr²  Lukas Richtera²  Lukas Nejdl²  Kledi Xhaxhiu²  Petr Vitek¹  Branislav Rutkay-Nedecky²  David Hynek²  Pavel Kopel²  Vojtech Adam²  Rene Kizek³ 

[1] Global Change Research Institute, The Czech Academy of Sciences, v.v.i., Bělidla 4a, Brno CZ-603 00, Czech Republic;Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, Brno CZ-613 00, Czech Republic;;Department of Biomedical and Environmental Analysis, Wroclaw Medical University, Borowska 211, Wrocław PL-50 556, Poland

关键词: carbon;    cyclic voltammetry;    electrochemical impedance spectroscopy;    electrochemistry;    graphene oxide;    heavy metal detection;    reduced graphene oxide;   

DOI  :  10.3390/ma9010031

来源: mdpi

【 摘 要 】

Increasing urbanization and industrialization lead to the release of metals into the biosphere, which has become a serious issue for public health. In this paper, the direct electrochemical reduction of zinc ions is studied using electrochemically reduced graphene oxide (ERGO) modified glassy carbon electrode (GCE). The graphene oxide (GO) was fabricated using modified Hummers method and was electrochemically reduced on the surface of GCE by performing cyclic voltammograms from 0 to −1.5 V. The modification was optimized and properties of electrodes were determined using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The determination of Zn(II) was performed using differential pulse voltammetry technique, platinum wire as a counter electrode, and Ag/AgCl/3 M KCl reference electrode. Compared to the bare GCE the modified GCE/ERGO shows three times better electrocatalytic activity towards zinc ions, with an increase of reduction current along with a negative shift of reduction potential. Using GCE/ERGO detection limit 5 ng·mL⁻¹ was obtained.

【 授权许可】

CC BY   
© 2016 by the authors; licensee MDPI, Basel, Switzerland.